Cut everything off for a few minutes then turn it back on and listen for a click from the compressor relay as the compressor tries to start.Is the compressor motor running.If no check starter/overload relay. Check to see if the condenser fan at the back underneath near the compressor is running. If no check fan.

Are the condenser coils near there warm or room temp. should be warm

Is the evaporator fan in the freezer running. It blows cold air into the fridge side through a damper in the wall between the freezer and fridge. Make sure the damper is open.

Below the evaporator fan is the evaporator coils. Remove the back cover in the freezer to observe the frost pattern. Light frost everywhere(NORMAL) or a partial pattern of ice(LOW ON FREON) or nothing(LOW FREON OR COMPRESSOR PROBLEM).

Possible that the vent is getting blocked to prevent the cool air to be blown into the fridge section. So make sure that the auto defrost is working, if not check the auto defrost timer section, the fan, the heaters.
make sure that the thermostat is set to normal.
Finally shut off the fridge for 6-8 hours and see if the cooling resumes. If so the defrost section must be revisited

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JENn-air is a maytag product . very dependable . if your would like the month and year i will need the ser #. this is a uppper unit and most owners like them . mm hope this helps if more help is needed get backk to me ,

If the freezer is staying cold it sounds like a defrost system problem. A bad timer, heater or thermostat can cause frost to build up on the coils and block air flow to the refrig side. Check out ACMEHowTo.com for troubleshooting the defroster problem.
There is a small duct between the freezer and refrigerator side if this is blocked the frig side won't cool.

turn freezer to higher temp and turn fresh to lower temp this maximizes airflow into the refrigerator. check the door that regulates airflow into fresh side..see if its stuck closed for some reason. good luck! :)

most fridges have a evaporator dish or container. it must be emptied ...and cleaned and disinfected.

now-a -days they are usually mated with the compressor and cool this unit down. notice there is no coil along the back of the fridge...it is usiually behind the fridge at the bottom with a cardboard or plastic access cover...this will make the unit cool better and return the cooling to normal....\nextclean out your freezer...i bet it's full of 4 month old packs of something you'll never eat....this will let the freezer breathe and circulate air to the coil ...i bet it has 3 in of ice on it...yikes...your not alone...most people do this...\get a freezer if your getting ready for the apocalypse and liberate some room.good luck